parsing ip packets
Wed May 3 19:13:39 CEST 2006
Thanks is there document or tutorial how I would apply this to a
program .... I am going over lisp tutorial to get a better grasp of
working with lists
Is this a list description... following will following getting
started and the REPOS tutorial bring up to speed to apply the code .....
On May 3, 2006, at 11:47 AM, Javier París wrote:
> El Miércoles, 3 de Mayo de 2006 18:10, a escribió:
>> I am new learning erlang ... are there examples of parsing a ip
>> packet to determine what time ?
> Parsing a (binary) ip packet would be something like..
> <<4:4/integer, % Ip Version
> Hd_Len:4/integer, % Header Length
> Tos:8/integer, % Tos
> Len:16/big-integer, % Packet Length
> Frg_Id:16/big-integer, % Fragment Id
> _:2/integer, % Two first flags... bah
> Mf:1/integer, % More Fragments flag
> Offset:13/big-integer, % Fragment Offset
> TTL:8/integer, % TTL
> Protocol:8/integer, % Upper layer protocol
> Checksum:16/big-integer, % Checksum
> Src_Ip:32/big-integer, % Where this pile of shit came from...
> Dst_Ip:32/big-integer, % Should check this against our Ip
> Options/binary>> = Ip_Header, % Options
> This would be for a rfc791 Ip packet. That is, it is a bit outdated.
> (For example, TOS isn't used anymore, and that field is used
> for explicit congestion notification, among other things).
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